Many factors cause the markets to fluctuate. Too many to list but a good example is the 2011 drop under Obama. Was it his fault? Nope it was Brexit
the president gets too much credit or blame for the stock market when in truth they can do little to affect it, outside of declaring war or dropping a nuke or something.
people just tend to use it as ammo or defense to keep stupid arguments alive.
that said, i giggle when i now hear it's trumps market.

it did shoot up damn fast, too fast to sustain. it's corrected. we'll see if it needs to do more today. is this a new direction or a blip on the radar and people selling out and taking their money and running?
bitcoin has a lot to do with it these days also.